Selling into news This happens all the time, as speculators buy before news, and sell regardless of what the news is. They have captured a nice short-term gain, and will be sold out in short order. Once that is done, we will probably see value investors return. Considering what this mine could produce in cash flow, MAT at 45 cents is obviously undervalued.
And even though the share price has gone nowhere this morning, 2 million shares have already been transferred from short-term speculators to longer-term value investors.
There is definitely NO reason for the share price to drift down, and every reason for it to appreciate over time. Buy, hold, and let the company make you money.